F.353 — Burner shutdown: Insufficient gas supply, reduced output

What does F.353 mean?

The burner has shut down (with potential for restart if demand exists) due to an insufficient gas supply, leading to reduced burner output. This means the boiler isn't getting enough fuel.

• Insufficient gas supply
• Contaminated input-side screen in the gas solenoid valve

Click steps to track your progress.

1. 1

   Check your gas supply and ensure there are no interruptions or low pressure.

2. 2

   Visually inspect the input-side screen in the gas solenoid valve for any contamination or debris.

3. 3

   Reset the boiler by briefly turning off and on its power supply. If the issue persists, contact a qualified heating engineer or your gas provider.